code: def region_name(sagemaker_session):
      return sagemaker_session.boto_session.region_name
  
file_path: sagemaker-python-sdk/tests/integ/sagemaker/workflow/test_triggers.py
imports: from __future__ import absolute_import
  import os
  import pytest
  import time
  import re
  from datetime import datetime, timedelta
  from sagemaker.workflow.functions import Join
  from sagemaker.workflow.parameters import ParameterInteger, ParameterString
  from sagemaker import TrainingInput, image_uris, get_execution_role, utils
  from sagemaker.estimator import Estimator
  from sagemaker.workflow.steps import TrainingStep
  from sagemaker.workflow.triggers import PipelineSchedule
  from sagemaker.workflow.pipeline import Pipeline
  from tests.integ.sagemaker.workflow.helpers import validate_scheduled_pipeline_execution
  from tests.integ import DATA_DIR
label_desc: Use image node_id 2 for calling a global function with example usage: region_name(sagemaker_session) and returns: sagemaker_session